Automatic web break detector in the rolling press



y 28, 1959 SHUHEI SHIBA 2,896,944

AUTOMATIC WEB BREAK DETECTOR IN THE ROLLING PRESS Filed Jan. 17 1956 United States Patent Olfice 2,896,944 na enteauui 28,119.59.

AUTOMATIC WEB DE'I-E'GTUR IN- ROLLING PRESS Sliuhei-Shiba, TokymJa'pam.

Application January 17,' 1-95'6, Srial No.- 559,732

aciaimsr (Cl.2-71- 12.3),.

This invention relates; to :anjimprovement. in all-. automatiewebrbreak:detector-for a,machine such .asa rolling press: forrthepurpose. of stopping the machine;when the web. has; broken or ended. ThemsuaLautoHlatie. webs break detector of this kind consists-of.- a;.detecting touching the. web at.an: intermediateportionof the web. suspended between two. guide rolls and. a. switch moved by. saidsdetecting, arm. to close an..electrie; circuit. which, causes v the brake. member. of. the. printing machine. to :be. actuated thus stopping the machine;

In such :construction; the. surfaeevof. web ,undenthe detectingg armalways .vibrates. up a-nd. down.;whi.le.the ma.-. chine is-.working, .so .that the, rangecof.motiomoflhedee tecting', arm .required .toclosethe. .switch must necessarily, be made rather long, in order topreventtheswitch con tactsnfronrbeing, accidentally, closed. by, such. shaking or vibration -.of.the.surface,.of-. web: Thus. the partscf the. detector becomemarkedly. large and heavy,., Itsfollows. that, since the:space.wherein.-the, detector isle-beset, being located usually in a group of several kinds of rolls, is extremely} limited *and: narrow, ,the.deteetorrisrunavoidably required .to .work. undera; very, unsatisfactory condition.

Anothertrouble occurs when a newrweb is to-be p assed by human: hands through-beneath the-detecting arms located at several portions of the machine since considerable care is required not to hurt or break the web, because the web touched by the detecting arms at one side only at the suspended portions, is very easily torn. Owing to the same reason, the pressure with which the detecting arm touches the web must very carefully be adjusted. That is to say, such construction can result in much trouble during operation and also a waste of time in handling the web.

The object of my invention is to obtain an automatic web break detector free from vibration of the suspended portion of the web and therefore small sized and light weight and consequently capable of being set in a very limited narrow space between the rolls for the most effective working.

Another object of my invention is to provide such an automatic web break detector as can be set adjustably at any desirable direction around a roll such as the guide roll over which the web runs to facilitate its mostefiicient operation.

My invention consists of chiefly a roll having a narrow circular groove on the periphery thereof over which a web is fed, at detecting member including a detecting arm and a switch, and a support member including a support arm and a support ring. The details of those members will be disclosed in the accompanying explanations with reference to the drawing.

The accompanying drawing illustrates the features of my invention. Figs. 1 and 2 are diagrammatic side views of the invention, the former depicting a condition where the web is running faultlessly while the latter depicts a situation where the web is broken. Fig. 3 shows a perspective view of a; guideroll; having narrow.- grooves. around the surface, together with; thqweb-running there. 011-1. Fig. .4--is;.a vertical section; of; a; guide; roll.- with; its bearingblock, 011.".WhlCh a.practicalgembodimentof my; invention isfmountedr Figs. S'and 6 3iIQ',SGQtiOIIaI-;Sld; views of the. invention corresponding ;to,.the construction; shown imF-ig; 4,- the former depictinga; conditionwhere the-eweb is not damaged, while-zthe latterrdepicts. ad QnT. dition .where-the; web is broken; Fig.- 7 is; the;.-si de view;. of the': attachment illustrating; the supportv vring and the; support fixedthereon,=. corresponding to the; QOIle struction shown in Fig. 4. Figs. 8 andi-9rare sidiviews of. thersupport member set 1 at,di1ferent directions; while,- Figs. 1,0 and ll'fiare-sectional.sidewiews of thedetecting; inernbenat v different positions corresponding to the; ones; shown -at Figs. 8-.andt9 respectively.

Acoording;.-to the drawing; A- is; a roll such as: aizguide. roll. B is-a:web;passingupon-the guide rollA C and;G; aresnarrowgrooves made around the -surfac fatherguide roll A.-,. D- issaapivotally mountedideteeting; arm.-having; anaend pprrtion; D." bent in. a-.direction; away;. from roll; A= n a n-int rme ia ner ionDf-wh ch t eeerceve C; in roll- Asin'the event.theweb:B.-breaks t the-roll is apivot. 91 the detecting, arm. 13,, situated; on ,1; the; ra ke :to esuppo t mrk E srar pring: to; actuaterthesdetecting-,arm. D. -to.;press thewweb againstthe; guide roll A: G .is ;a,.switchce rif rat-1 thef'endg ;sup,-. p r r mll. Switch. G nel es a p i otrstat nnam onr. tacts;G'--G" and a cmovableabridgecontact G} which is, actuated by anupstanding; projection. D"'-' on; arm 5 D; So,+long assweb-B;-remainS ntactatrol-l thQglIltfiFflilfidiy atepprtion D orfarmD -#rides err-top. o, g r l ehro i i n he;pr jec on: D? hitsr p: werdly against the contactbridgefi' and;. hold s.--the latter.- disenga edrromthes at ona yc ntae sweifi. hould; however, the web B break at roll A, the downward f rce; edda:- Pl H 2E l: ca t in enned a e: por ion 5* ofarm D.to; enter,-- therroll; groove Qthus; lowering hemnnmd e nmiQ QmD?" a decausin t ean;- et-vbn e o-.' nd enga e the ta onary; ac s F=',;G as h wn niF a; 2 :andz her bv complete the energization of a brake circuitgM;whielr stops the machine, it being noted that such brake circuit does not include the roll A as a component thereof and consequently is independent of the same. The support arm I is made of preferably a hollow pipe to pass the electric cords through for the sake of safety and clearing of the machine. K is a bearing block for the guide roll, around which preferably a circular shallow groove K is made concentric to the axis of the guide roll, for steady fixing and easily adjustable setting of a two part support ring L. The support ring or attachment block consists of two parts L and L", one of which has a bracket L' holding the support arm I parallel to the axis of the guide roll.

M is a part of the frame of the machine, to which the bearing block K is fixed by set screws N, N. O, O are thumb screws for adjustable setting of the support ring L to the bearing block K along its circular groove K. P shows electric cords connecting the switch G to an electric magnet or motor is to move the brake member to stop the machine when the web has broken. The cords are preferably passed through the hole of the sup:- port arm I as already stated. The arrows show the direction in which the Web runs over the roll A.

As canbe seen in the drawing, the detecting arm is situated transversely to the guide roll A and inline with the groove C in the roll. Therefore, when the :web runs undamaged the detecting arm D remains lifted by the surface of the web even on the narrow groove C. But

should it happen that the web break away for any reason,

the detecting arm D will immediately drop into the narrow groove C, consequently closing the contacts of switch G and completing the electric circuit to actuate the brake member to stop the machine. The brake mechanism is conventional and hence has been omitted in the interest of simplifying the drawings. 7

Since the narrow groove C can be'located in such line along which the web runs unprinted, for instance, along a folding line in the case of newspaper printing, the groove can be kept free from ink deposits.

The fundamental idea of my invention is that the de tecting arm is made to touch the web at the guide roll on the alignment of the narrow groove thereof when there is no up-and-down motion of the web instead of at a suspended portion of the web where such motion is apt to occur. Locating the detector arm at the groove has many advantages, one of which is that there is no need to use specially a low voltage current for keeping the human body free from the danger of electric shock, this for the reason that the substantial displacement available for the detecting arm in dropping into the groove permits use of a switch in the circuit which is insulated entire-1y from the frame of the machine. This would not be possible were the detector arm to be arranged to close an electric circuit which passes through the machine frame by the direct contact of the detector arm with the metallic non-grooved surface of the roll which are used as electric conductors in the switch circuit. The second advantage of this construction is that a delicate adjustment of the pressure with which the detecting arm is made to touch the web is no longer necessary, owing to the increase of supporting strength of the web suspended by the edges of the grove at a very small distance. The third advantage of this construction is that, since the detecting arm is no longer influenced by the vibration of the Web, the range of the motion of the detecting arm can be markedly reduced, so that the detector becomes very small and light. Consequently, the detector can be set at its most suitable position around the guide roll for an effective operation.

Figs. 8, 9 and Figs. 10, 11 illustrate the detector set at difierent angular directions around the roll axis. By loosening the thumb screws 0, O, and changing the angular position of the support ring L aroundthe bearing block K, the detecting member can be fixed at its optimum operating position.

In the claims:

1. In a machine having an electrical brake circuit, the combination of a roll having a narrow circular groove extending around the periphery thereof and over which roll and groove a web is fed, a web break detecting mechanism comprising a detecting arm having a groove entering portion thereof in alignment with and enterable into said roll groove upon a break in the web at said roll, means mounting said detecting arm for movement of said groove entering portion into said roll groove. spring means urging said groove entering portion of said detecting arm to bear against the web at the location of said roll groove, and electrical switch means including contact means actuated by movement of said groove entering portion of said detecting arm into said roll groove upon a break in the web at said roll for energizing the electrical brake circuit independent of said roll for stopping said machine.

2. The combination as defined in claim 1 and which further includes an element carrying said detecting arm at one end thereof, said element being arranged parallel to the axis of said roll, and means for supporting said element on said machine.

3. The combination as defined in claim 2 wherein said supporting means for said element comprises a support ring surrounding a cylindrical bearing block for said roll, and means for adjusting said support ring angularly about the axis of said roll.

4. The combination as defined in claim 3 wherein said support ring comp-rises two semi-circular half sections, and said adjusting means for said support ring comprises adjustable bolts interconnecting said ring half sections around said bearing block.

5. The combination as defined in claim 2 wherein said element is of tubular form and contains electric cords, the ends of said cords being connected to said switch means controling said brake circuit.

References Cited in the file of this patent UNITED STATES PATENTS 946,882 Sheppard Jan. 18, 1910 1,149,018 Beregh Aug. 3, 1915 

